San Gregorio (2 mi SE), California climate: Climate normals at a NOAA weather station
San Gregorio (2 mi SE)'s normal year runs from 40°F December nights to 71°F August afternoons, with 30.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.7°C, December lows of 4°C, August highs of 21°C, 772 mm of precipitation a year.
- NOAA stationSan Gregorio (2 mi SE)
- Station IDUSC00047807
- Location37.31°N 122.36°W
- Elevation275 ft (84 m)
On October 23, the normal high in San Gregorio (2 mi SE) is 68°F and the normal low 44°F, and the chance of measurable rain or snow is 21%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for San Gregorio (2 mi SE).
- Jan 60° 40°
- Feb 60° 41°
- Mar 61° 42°
- Apr 62° 43°
- May 64° 46°
- Jun 67° 48°
- Jul 69° 52°
- Aug 71° 52°
- Sep 72° 49°
- Oct 69° 45°
- Nov 63° 41°
- Dec 59° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at San Gregorio (2 mi SE) each month?
August is the warmest month, with normal highs of 71°F; December the coldest, with normal lows of 40°F. The most precipitation falls in February (6.17 in), the least in July (0.12 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 60°F | 40°F | 50.0°F | 5.78 | 14 | <1 | 5 | 9 h 50 min |
| February | 60°F | 41°F | 50.8°F | 6.17 | 14 | <1 | 2 | 10 h 50 min |
| March | 61°F | 42°F | 51.3°F | 4.34 | 12 | <1 | 1 | 11 h 50 min |
| April | 62°F | 43°F | 52.7°F | 2.32 | 10 | <1 | <1 | 13 h 10 min |
| May | 64°F | 46°F | 55.0°F | 0.91 | 6 | <1 | <1 | 14 h 10 min |
| June | 67°F | 48°F | 57.3°F | 0.44 | 4 | <1 | <1 | 14 h 40 min |
| July | 69°F | 52°F | 60.5°F | 0.12 | 3 | <1 | <1 | 14 h 30 min |
| August | 71°F | 52°F | 61.0°F | 0.16 | 3 | <1 | <1 | 13 h 40 min |
| September | 72°F | 49°F | 60.5°F | 0.17 | 3 | 1 | <1 | 12 h 30 min |
| October | 69°F | 45°F | 57.0°F | 1.26 | 5 | 1 | <1 | 11 h 20 min |
| November | 63°F | 41°F | 52.4°F | 2.59 | 10 | <1 | 3 | 10 h 10 min |
| December | 59°F | 40°F | 49.5°F | 6.13 | 13 | <1 | 5 | 9 h 40 min |
| Year (annual) | 65°F | 45°F | 54.8°F | 30.39 | 96 | 2 | 16 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 15°C | 5°C | 10.0°C | 147 mm |
| February | 16°C | 5°C | 10.4°C | 157 mm |
| March | 16°C | 5°C | 10.7°C | 110 mm |
| April | 17°C | 6°C | 11.5°C | 59 mm |
| May | 18°C | 8°C | 12.8°C | 23 mm |
| June | 19°C | 9°C | 14.1°C | 11 mm |
| July | 21°C | 11°C | 15.8°C | 3 mm |
| August | 21°C | 11°C | 16.1°C | 4 mm |
| September | 22°C | 10°C | 15.8°C | 4 mm |
| October | 20°C | 7°C | 13.9°C | 32 mm |
| November | 17°C | 5°C | 11.3°C | 66 mm |
| December | 15°C | 4°C | 9.7°C | 156 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00047807; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at San Gregorio (2 mi SE)?
Normal highs sit between 65°F and 85°F in June, July, August, September and October. Of those, September has the fewest days with rain (3).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00047807.
When is the last frost at San Gregorio (2 mi SE)?
In San Gregorio (2 mi SE), the last spring frost (32°F) comes after March 2 in half of years and after April 15 in one year in ten; the first autumn frost comes before November 25 in half of years and before November 1 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- March 21 year in 10 after April 15; 9 in 10 after December 31
- First autumn frost, half of years before
- November 251 year in 10 before November 1; 9 in 10 before January 1
NOAA puts the median frost-free season at 268 days, and the season without a hard freeze (28°F) at 351 days.
A hard freeze (28°F) comes after January 2 in half of springs and before December 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts San Gregorio (2 mi SE) in zone 9b in ZIP code 94074, the nearest ZIP area.
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00047807; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at San Gregorio (2 mi SE)?
In a normal year in San Gregorio (2 mi SE), 2 days a year reach 90°F, 16 nights fall to 32°F or colder and 96 days bring measurable precipitation.
- Days at 90°F or more
- 2a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 16a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 96a normal year
The highest temperature in this station's record (since 1954) is 99°F, on October 15, 1961; the lowest is 20°F, on December 21, 1998.
The wettest calendar year on that record is 1983, with 57.86 in; the snowiest season is 1961–62, with 4.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00047807; records: ACIS (NOAA Regional Climate Centers), station USC00047807. Records use complete months only; a month missing more than three days is left out.
How sunny is it at San Gregorio (2 mi SE)?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds at San Gregorio (2 mi SE), 4.7 kWh per square metre a day. June is the sunniest month (84%) and December the cloudiest (74%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.5 |
| February | 77% | 3.4 |
| March | 79% | 4.6 |
| April | 82% | 6.0 |
| May | 81% | 6.7 |
| June | 84% | 7.3 |
| July | 78% | 6.5 |
| August | 77% | 5.8 |
| September | 82% | 5.1 |
| October | 83% | 4.0 |
| November | 81% | 2.8 |
| December | 74% | 2.1 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does San Gregorio (2 mi SE) record?
A normal year at San Gregorio (2 mi SE) brings 3,722 heating degree days, 31% fewer than the median U.S. place (5,373), and 23 cooling degree days, 97% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,010 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 465 | 0 |
| February | 398 | 0 |
| March | 423 | 0 |
| April | 371 | 0 |
| May | 309 | 1 |
| June | 233 | 2 |
| July | 144 | 4 |
| August | 126 | 4 |
| September | 140 | 7 |
| October | 254 | 4 |
| November | 380 | 0 |
| December | 479 | 0 |
| Year (annual) | 3,722 | 23 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00047807. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does San Gregorio (2 mi SE)'s climate compare?
San Gregorio (2 mi SE) is warmer than 41 of the 219 places with their own NOAA record in California, and wetter than 168. Across the 7,247 U.S. stations with normals, its annual mean of 54.8°F is warmer than 59%.
In the Köppen classification computed from these normals, San Gregorio (2 mi SE) is Csb: temperate, dry-summer, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near San Gregorio (2 mi SE) share this climate record?
2 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Pescadero, CA478 people · 5 mi S
- Loma Mar, CA319 people · 5 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about San Gregorio (2 mi SE)'s climate
What is the coldest month at San Gregorio (2 mi SE)?
December, with a normal high of 59°F and a normal low of 40°F. The warmest is August (71°F by day, 52°F at night).
Does it snow at San Gregorio (2 mi SE)?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month at San Gregorio (2 mi SE)?
February, with 6.17 in of precipitation in a normal year; the driest is July with 0.12 in.
What plant hardiness zone is San Gregorio (2 mi SE) in?
The USDA's 2023 map puts San Gregorio (2 mi SE) in zone 9b in ZIP code 94074, the nearest ZIP area.
How late can frost come at San Gregorio (2 mi SE)?
In half of years the last 32°F night comes after March 2; in one year in ten it comes after April 15. Waiting until April 15 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Skyline Ridge Preserve, CA10 miles from this station, 57.1°F a year
- Woodside, CA10 miles from this station, 60.1°F a year
- Half Moon Bay, CA12 miles from this station, 54.9°F a year
- Redwood City, CA13 miles from this station, 59.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made